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Matilija Dam Ecosystem Restoration Project CEQA Scoping Period Information

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Matilija Dam Ecosystem Restoration Project CEQA Scoping Period Information Matilija Dam Ecosystem Restoration Project CEQA Scoping Period Information This presentation provides information regarding the California Environmental Quality Act, or CEQA, Scoping Period for the Matilija Dam Ecosystem Restoration Project. •1 Purpose of Scoping Period • Inform the public about the Project and the CEQA environmental review process. • Seek input on the scope and content of the Subsequent Environmental Impact Report (SEIR), including potential environmental issues, mitigation, and alternatives to be analyzed. Slide 2 The purpose of Scoping is to inform the public about the Project and the environmental review process, as required by CEQA. Scoping for the Matilija Dam Ecosystem Restoration Project provides an opportunity for the public to give input on the scope and content of the Subsequent Environmental Impact Report, or Subsequent EIR. Input may include identifying specific environmental issues, mitigation measures to reduce environmental impacts, or potential alternatives to project actions. •2 Ventura River Watershed Slide 3 Matilija Dam is located along Matilija Creek, approximately 16 miles north of the Pacific Ocean in western Ventura County, California. Approximately one‐half mile southeast of the Dam, Matilija Creek and North Fork Matilija Creek join to create the Ventura River, which has a drainage area of approximately 226 square miles. The Los Padres National Forest surrounds the portions of the Project area along Matilija Creek and Matilija Dam. Downstream of the Dam, the Ventura River flows south past the western edge of the City of Ojai, and through unincorporated communities within Ventura County. In its lower reaches, the Ventura River flows through the City of Ventura until it reaches its estuary with the Pacific Ocean. •3 Matilija Dam Built 1947 Matilija Creek (pre-dam construction) Slide 4 Matilija Dam was constructed in 1947 with the purpose of providing water supply and flood control for the Ojai Valley. Prior to dam construction, the Ventura River was known by fishermen for its annual run of southern steelhead trout. 4 Where is the lake? • 8 million cubic yards of sediment is trapped behind Matilija Dam. • Only 2% of the initial reservoir capacity remains. Friday, September 4, 2020 Slide 5 Since 1947, natural creek sediments have accumulated behind Matilija Dam, diminishing the reservoir capacity. On the photo on the right, the former lake area is outlined in blue. An estimated 8 million cubic yards of sediment is currently trapped behind the Dam. The initial reservoir capacity was over 7,000 acre‐feet of water. Today the reservoir capacity is only 150 acre feet, which is only 2 percent of the original volume. An acre‐foot of water is the amount of water necessary to cover one acre of surface area to a depth of one foot, or about 325,850 gallons of water. Because the Dam inhibits sediment transport, which is a fundamental mechanism for beach replenishment, downstream beaches have narrowed measurably since construction of Matilija Dam. With a diminished supply of river‐based sand replenishment, beaches in the region are becoming increasingly eroded, causing habitat reduction and a loss of beach sand for recreational use. 5 Appraisal Study 1998-2000 In 1997, the Southern California steelhead trout was federally listed as an endangered species. To restore habitat access for the southern California steelhead, the County Board of Supervisors directed the Ventura County Watershed Protection to study dam removal. Slide 6 In 1997, 50 years after Matilija Dam construction, steelhead were listed as endangered under the Federal Endangered Species Act. Since Matilija Dam blocks access to prime spawning habitat for the steelhead trout, the Ventura County Board of Supervisors directed the Flood Control District to study dam removal. They partnered with the U.S. Bureau of Reclamation to produce a Dam Removal Appraisal Report in the year 2000. The Flood Control District changed its name to Watershed Protection in 2003, and is part of the Ventura County Public Works Agency. 6 2004 Feasibility Study and EIS/EIR Partnered with U.S. Army Corps of Engineers to prepare a Feasibility Study and an EIS/EIR for the Matilija Dam Ecosystem Restoration Project. Over 40 government and non- governmental agencies and water purveyors participated in the environmental review process, as well as numerous members of the public. Slide 7 Following the completion of the Appraisal Study, Watershed Protection partnered with the U.S. Army Corps of Engineers to prepare a feasibility study and a joint Environmental Impact Statement and Environmental Impact Report for the Matilija Dam Ecosystem Restoration Project. The feasibility study considered 7 alternatives for dam removal, and the EIS/EIR evaluated the short‐term and long‐term impacts from the proposed project components and alternatives. Over 40 government and non‐governmental agencies and water purveyors participated in the environmental review process, as well as numerous members of the public. Most of these stakeholders, and many others, remain actively engaged in the project development process. 7 Multiple Project Components Slide 8 The EIS/EIR evaluated the multiple project components that comprise the Matilija Dam Ecosystem Restoration Project. Prior to dam removal, downstream protection components need to be constructed to protect communities and infrastructure from sediment released. These include increasing the capacity under the Camino Cielo and the Santa Ana Boulevard Bridges, upgrading the levees in Live Oak Acres and Casitas Springs, constructing a new levee in Meiners Oaks, and altering the Robles Diversion water supply facility. The preferred dam removal alternative in 2004 included the removal of the accumulated sediment within the reservoir area. Some sediment would be placed in Matilija Canyon and some would be placed on the wide floodplains downstream. •8 Project Component Progress • 2007: Began Giant Reed Removal on 1,200 acres. • 2008: Raised Casitas Springs Levee by 4 feet. • 2009-2010: Drilled and Developed two wells at Foster Park. • 2009: Acquired former County Park Hot Springs Property. Most structures on site were lost in the Thomas Fire. This site will serve as a staging area for dam removal and will become a future recreational feature. • 2011: Created the trailhead at the end of Old Baldwin Road that serves as an equestrian and all accessible trail. • 2020: Will begin construction of new Santa Ana Blvd. Bridge and widen the Ventura River. Slide 9 Since the certification of the 2004 Environmental Impact Statement and Environmental Impact Report, Watershed Protection has completed a number of project components of the Matilija Dam Ecosystem Restoration Project. These projects include: • Ongoing giant reed removal on 1,200 acres; • Raising Casitas Springs Levee by 4 feet; • Drilled and developed two wells at Foster Park; • Creating the trailhead at the end of Old Baldwin Road that serves as an equestrian and handicap accessible trail; • Acquiring the former County Park Hot Springs Property to serve as a staging area for dam removal, which will become a future recreational feature. Unfortunately, the structures at the former County Park Hot Springs Property were lost in the Thomas Fire in 2017. • And lastly, the Santa Ana Boulevard Bridge Replacement and Ventura River widening project will begin in late 2020. •9 Next Steps in Project Planning Since the 2004 EIS/EIR, sediment transport and hydrology models have greatly improved, and many dams across the country have been removed and studied. Between 2008 and 2016, this new information was applied to the Matilija Dam Ecosystem Restoration Project, and a new alternative has been developed for dam removal. Several other project components now have preliminary designs. VCPWA-WP is preparing a Subsequent EIR (SEIR) to analyze these proposed modifications to the Matilija Dam Ecosystem Restoration Project. Slide 10 Since the certification of the 2004 Environmental Impact Study and Environmental Impact Report, Watershed Protection and the design team has applied new information about dam removal to the project. Sediment transport and hydrology models have greatly improved, and many dams across the country have been removed and studied. Between 2008 and 2016, this new information was applied to the Matilija Dam Ecosystem Restoration Project, and a new alternative has been developed for dam removal. In addition, several other project components are now in the design phase. In June 2017, Watershed Protection received funding to implement the Matilija Dam Removal 65% Design Planning Project. The updated plan to remove Matilija Dam incorporates new information garnered from recent dam removal projects as well as modifications to downstream infrastructure. Watershed Protection has determined that preparation of a Subsequent EIR is warranted to evaluate the revised Project components which have adequate design details at this time. •10 Purpose of the SEIR 1. Evaluate the environmental effects from the revised method for Matilija Dam removal. 2. Analyze updated design and construction plans for the following downstream components: • Camino Cielo Bridge • Live Oak Acres Levee • Casitas Springs Levee Slide 11 The Subsequent EIR will provide a complete and objective analysis of the revised plan for dam removal, as well as a project‐specific analysis of the environmental effects associated with the development of three other Project components, which include the replacement of the Camino Cielo Bridge, the reconstruction
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